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/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Battery LED control for Quawks
*/
#include "charge_state.h"
#include "chipset.h"
#include "gpio.h"
#include "hooks.h"
#include "led_common.h"
#include "lid_switch.h"
#include "pwm.h"
#include "util.h"
const enum ec_led_id supported_led_ids[] = {
EC_LED_ID_BATTERY_LED, EC_LED_ID_POWER_LED};
const int supported_led_ids_count = ARRAY_SIZE(supported_led_ids);
enum led_color {
LED_OFF = 0,
LED_ORANGE,
LED_GREEN,
};
/**
* Set battery LED color
*
* @param color Enumerated color value
*/
static void set_battery_led_color(enum led_color color)
{
pwm_set_duty(PWM_CH_LED_BATTERY_ORANGE, color == LED_ORANGE ? 100 : 0);
pwm_set_duty(PWM_CH_LED_BATTERY_GREEN, color == LED_GREEN ? 100 : 0);
}
void led_get_brightness_range(enum ec_led_id led_id, uint8_t *brightness_range)
{
if (led_id == EC_LED_ID_POWER_LED) {
brightness_range[EC_LED_COLOR_GREEN] = 100;
} else {
brightness_range[EC_LED_COLOR_RED] = 100;
brightness_range[EC_LED_COLOR_GREEN] = 100;
}
}
int led_set_brightness(enum ec_led_id led_id, const uint8_t *brightness)
{
if (led_id == EC_LED_ID_POWER_LED) {
pwm_set_duty(PWM_CH_LED_POWER_GREEN,
brightness[EC_LED_COLOR_GREEN]);
} else {
pwm_set_duty(PWM_CH_LED_BATTERY_ORANGE,
brightness[EC_LED_COLOR_RED]);
pwm_set_duty(PWM_CH_LED_BATTERY_GREEN,
brightness[EC_LED_COLOR_GREEN]);
}
return EC_SUCCESS;
}
static void led_init(void)
{
/* Configure GPIOs */
gpio_config_module(MODULE_PWM_LED, 1);
/*
* Enable PWMs and set to 0% duty cycle. If they're disabled, the LM4
* seems to ground the pins instead of letting them float.
*/
pwm_enable(PWM_CH_LED_BATTERY_ORANGE, 1);
pwm_enable(PWM_CH_LED_BATTERY_GREEN, 1);
pwm_enable(PWM_CH_LED_POWER_GREEN, 1);
pwm_set_duty(PWM_CH_LED_POWER_GREEN, 0);
set_battery_led_color(LED_OFF);
}
DECLARE_HOOK(HOOK_INIT, led_init, HOOK_PRIO_DEFAULT);
/**
* Return new duty cycle for power LED (0-100).
*/
static int new_power_led_brightness(void)
{
static unsigned ticks;
static int suspended_prev;
int suspended = chipset_in_state(CHIPSET_STATE_SUSPEND);
/* If we're just suspending now, reset ticks so LED changes quickly */
if (suspended && !suspended_prev)
ticks = 0;
else
ticks++;
suspended_prev = suspended;
/* If lid is closed, LED is off in all chipset states */
if (!lid_is_open())
return 0;
/* If chipset is on, LED is on */
if (chipset_in_state(CHIPSET_STATE_ON))
return 100;
/* If chipset isn't on or suspended, it's off; LED is off */
if (!chipset_in_state(CHIPSET_STATE_SUSPEND))
return 0;
/* Suspended. Blink with 25% duty cycle, 2 sec period */
return (ticks % 8 < 2) ? 100 : 0;
}
/**
* Return new color for battery LED.
*/
static enum led_color new_battery_led_color(void)
{
static unsigned ticks;
int chstate = charge_get_state();
ticks++;
/* If charging error, blink orange, 50% duty cycle, 0.5 sec period */
if (chstate == PWR_STATE_ERROR || !charge_battery_responsive())
return (ticks & 0x1) ? LED_ORANGE : LED_OFF;
/* If charge-force-idle, blink green, 50% duty cycle, 2 sec period */
if (chstate == PWR_STATE_IDLE &&
(charge_get_flags() & CHARGE_FLAG_FORCE_IDLE))
return (ticks & 0x4) ? LED_GREEN : LED_OFF;
/*
* If the system is charging, orange; green if 95% or over.
* Subtract 4% to compensate for how the UI reports charge remaining.
*/
if (chstate == PWR_STATE_CHARGE)
return charge_get_percent() < 91 ? LED_ORANGE : LED_GREEN;
/* If AC connected and fully charged (or close to it), solid green */
if (chstate == PWR_STATE_CHARGE_NEAR_FULL ||
chstate == PWR_STATE_IDLE) {
return LED_GREEN;
}
/*
* Otherwise, discharging; flash orange if 10% or less power, 50%
* duty cycle, 2 sec period. Adding 4% bias to compensate for how
* the UI reports charge remaining.
*/
if (charge_get_percent() < 14)
return (ticks & 0x4) ? LED_ORANGE : LED_OFF;
/* Discharging and greater than 10% power, so off */
return LED_OFF;
}
/**
* Called by hook task every 250 ms
*/
static void led_tick(void)
{
if (led_auto_control_is_enabled(EC_LED_ID_POWER_LED))
pwm_set_duty(PWM_CH_LED_POWER_GREEN,
new_power_led_brightness());
if (led_auto_control_is_enabled(EC_LED_ID_BATTERY_LED))
set_battery_led_color(new_battery_led_color());
}
DECLARE_HOOK(HOOK_TICK, led_tick, HOOK_PRIO_DEFAULT);
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